Underfloor heating: Length of heating circuits

How long would the experts here choose the individual heating circuits of the underfloor heating?

I need about 1350-1400 m total length. With 12 heating circuits, that still results in a good 112 m per circuit. Is that too long or OK?

Can someone estimate what pressure loss occurs over 112 m with 16x2 pipe?

There are people who calculate that for you. Pressure loss depends on many factors and cannot be answered in general terms. 112 m 16er Rohr is already borderline..

I have actually read everywhere that a heating circuit should not be longer than 100m, and I have adhered to that.

Brevity is the soul of wit!

Have 80m +/-10% everywhere. Avoid particularly long loops, especially in rooms with high heating load, such as the bathroom.

Let a professional assess that.